What does it mean when a guy made you feel seen when you were teens? Why did he ignore me years later?

He was an attractive guy and when I was in this camp he was always nice and made me feel seen even though I was by myself and there were a lot of girls who didn’t talk to me or didn’t like me.

He stood up for me, he listened when no one else listened to me talk and he complimented me once.. he was kind to me.. first guy to call me pretty.

I always wanted to thank him.. he ended up following my cousins on social media but not me…

What does it mean when a guy made you feel seen when you were teens? Why did he ignore me years later?
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